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Summary of the K-Mount Evolution, Names, and Features

The following abbreviations are used throughout this page:

Figure 1 shows the K-mount "family tree." Each knot describes a mount variation, when it was introduced and what its name is. A branch running from variation A down to variation B indicates that B is based on A. The features that B has in addition to A are listed in blue; the features that B lacks in comparison to A are listed in red.

Family tree of the K-mount

Figure 1. Family tree of the K-mount.

The K-mount has been in existence since 1975, and has gone through a number of revisions since then. There exist a large number of bodies and lenses with different names and features, and it is somewhat of a challenge to keep all the nomenclature straight. Table 1 groups each mount variation with the bodies and lenses that are based on it.

Table 1. Mount variations and their corresponding body- and lens-series.
Mount
Variation
Bodies Lenses
K-mount K-series, M-series, LX SMC, SMC-M
KF mount ME F SMC-AF
KA mount A-series, P-series SMC-A
KA2 mount MZ-M/ZX-M
KAF mount SF-series, MZ-6/ZX-L, MZ-7/ZX-7 SMC-F
"crippled"
KAF mount
MZ-30/ZX-30, MZ-50/ZX-50, MZ-60/ZX-60, *ist SMC-FAJ
KAF2 mount Z/PZ-series, MZ-S, MZ-3, MZ-5n/ZX-5n,
MZ-5/ZX-5, MZ-10/ZX-10
SMC-FA
"crippled"
KAF2 mount (digital)
*ist digital series, K digital series SMC-DA, SMC-DFA

The K-mount has much to boast in terms of compatibility — if we exclude the bodies and lenses featuring the KF and the "crippled" KAF mount, combining any body with any lens produces a correctly-operating combo that possesses all features common to both pieces of equipment. Bodies and lenses featuring the KF mount are fully-compatible with each-other as are the bodies and lenses featuring the "crippled" KAF mount.

Table 2 lists all body-mount variations vertically and all lens-mount variations horizontally. Each cell enumerates all features that are possible when combining the respective mount variations. Note that not all bodies and all lenses implement every possible feature. Furthermore, there are features that are possible, yet no piece of equipment implements them. Such features are marked in the following way: phantom.

Table 2. Mount-variation capabilities.
Body/Lens
Combination
SMC, SMC-M Lens SMC-AF Lens SMC-A Lens
("A" aperture)
SMC-A Lens
(numerical aperture)
SMC-F Lens
("A" aperture)
SMC-F Lens
(numerical aperture)
SMC-FA Lens
("A" aperture)
SMC-FA Lens
(numerical aperture)
SMC-FAJ Lens
Original-K-mount
Body
M, Av
F, C, S
M, Av
F, C, S
M, Av
F, C, S
M, Av
F, C, S
M, Av
F, C, S
i
KF Body M, Av
F, C, S
M, Av
F, C, S
AF
M, Av
F, C, S
M, Av
F, C, S
M, Av
F, C, S
i
KA Body M, Av
F, C, S
M, Av
F, C, S
M, Av, Tv, P
F, C, S, Mx
M, Av, Tv, P
F, C, S, Mx
M, Av, Tv, P
F, C, S, Mx
Tv, P
F, C, S, Mx
KAF Body M, Av
F, C, S
M, Av
F, C, S
M, Av, Tv, P
F, C, S, Mx
M, Av, Tv, P, Pg
F, C, S, Mx
AF
D1
M, Av, Tv, P, Pg
F, C, S, Mx
AF
D1
Tv, P, Pg
F, C, S, Mx
AF
D1
KAF2 Body M, Av
F, C, S
M, Av
F, C, S
M, Av, Tv, P
F, C, S, Mx
M, Av, Tv, P, Pg
F, C, S, Mx
AF
D1
M, Av, Tv, P, Pg
F, C, S, Mx
AF
D2
PZ
Tv, P, Pg
F, C, S, Mx
AF
D2
KA2 Body M, Av
F, C, S
M, Av
F, C, S
M, Av, Tv, P
F, C, S, Mx
M, Av, Tv, P, Pg
F, C, S, Mx
D1
M, Av, Tv, P, Pg
F, C, S, Mx
D1
Tv, P, Pg
F, C, S, Mx
D1
"crippled"
KAF Body
ii ii M, Av, Tv, P; F, C, S, Mx ii M, Av, Tv, P, Pg; F, C, S, Mx; AF; D1 ii M, Av, Tv, P, Pg; F, C, S, Mx; AF; D1 ii Tv, P, Pg
F, C, S, Mx
AF
D1
"crippled"
KAF2 Body
iii iii M, Av, Tv, P; F, C, S, Mx iii M, Av, Tv, P, Pg; F, C, S, Mx; AF; D1 iii M, Av, Tv, P, Pg; F, C, S, Mx; AF; D2 iii Tv, P, Pg
F, C, S, Mx
AF
D2

i = The lens stays set to its smallest aperture (f/32 or f/38), so the combination is, in effect, unusable.
ii = Severe limitations. Read the full story.
iii = Some limitations. Read the full story.